If you've been comparing Milwaukee impact drivers and impact wrenches, you've probably noticed the names get used almost interchangeably online — even though they're built for different jobs. Picking the wrong one for your work can mean stripped fasteners, a tool that's underpowered for the task, or just spending more than you needed to.
Here's the difference, in plain terms, and which Sacramento tradespeople tend to reach for each one.
The Short Version
An impact driver is built for driving screws and fasteners quickly, with high rotational speed and moderate torque. An impact wrench is built for high-torque jobs — loosening or tightening nuts and bolts, especially ones that are rusted, over-torqued, or just need serious rotational force.
If your work is mostly screws and fasteners, you want a driver. If your work involves nuts, bolts, and lug-style fasteners, you want a wrench.
Milwaukee Impact Drivers
Milwaukee's M18 impact drivers are built around speed and control for fastening work. They're compact, lightweight compared to a wrench, and use a 1/4" hex chuck — the standard for driver bits.
Who reaches for an impact driver most:
- Carpenters and framers — driving large volumes of screws quickly
- Electricians — mounting boxes, panels, and fixtures
- General contractors and remodelers — deck screws, subfloor, trim work
- DIY homeowners — furniture assembly, general fastening around the house
Milwaukee Impact Wrenches
Milwaukee's M18 impact wrenches are built for torque, not speed. They use a square drive (commonly 1/2" or 3/8") designed to hold sockets, not driver bits, and they're engineered to break loose fasteners that an impact driver simply isn't built to handle.
Who reaches for an impact wrench most:
- Mechanics and auto repair shops — lug nuts, suspension work, drivetrain fasteners
- Plumbers and pipefitters — flange bolts and heavy fittings
- Industrial and equipment maintenance — anything bolted with high-torque hardware
- Farm and heavy equipment work — rusted or seized bolts that need real force to break free
Can One Tool Do Both Jobs?
Technically, you can drive some screws with a low-torque impact wrench, and some impact drivers can loosen light fasteners in a pinch. But neither is a real substitute for the other. Using a high-torque wrench on small fasteners tends to strip them or snap them off. Using a driver on heavy lug nuts usually just spins without breaking them loose.
If your work regularly involves both screws and bolts — which is common for general contractors and serious DIYers — owning both isn't overkill. It's the difference between fighting the wrong tool and finishing the job in half the time.
M18 Battery Compatibility
One advantage of staying within Milwaukee's M18 platform: drivers, wrenches, drills, saws, and most other M18 tools all share the same battery system. If you already own M18 batteries for a drill or driver, adding a wrench to your kit doesn't mean buying a whole new battery ecosystem.
Find Both at Tools For Less
We regularly carry Milwaukee M18 impact drivers and impact wrenches, sourced through retailer returns and inspected before they reach our shelves — priced below what you'd pay at full retail. Since inventory turns over based on what comes through our liquidation channels, the best way to know what's currently in stock is to call ahead or stop by.
4907 Auburn Blvd, Sacramento, CA 95841
Store Hours:
Monday–Friday: 9:00 AM – 6:00 PM
Saturday: 11:00 AM – 6:00 PM
Sunday: Closed
Phone: (916) 287-0496
Buy Online, Pick Up In-Store: Order from toolsforless.com and your order will be ready within 2 hours.
Not all products are listed online. Visit us in person to see our full in-store inventory.
